Fix incorrect multi line variable declaration capture for ","

Fixes #635

TypeScript.YAML-tmLanguage

@@ -249,7 +249,7 @@ repository:
     - begin: (,)\s*(?!\S)
       beginCaptures:
         '1': { name: punctuation.separator.comma.ts }
-      end: (?<!,)((?==|;|}|(\s+(of|in)\s+)|^\s*$))|((?<=\S)(?=\s*$))
+      end: (?<!,)(((?==|;|}|(\s+(of|in)\s+)|^\s*$))|((?<=\S)(?=\s*$)))
       patterns:
       - include: '#comment'
       - include: '#destructuring-variable'

TypeScript.tmLanguage

@@ -448,7 +448,7 @@
               </dict>
             </dict>
             <key>end</key>
-            <string>(?&lt;!,)((?==|;|}|(\s+(of|in)\s+)|^\s*$))|((?&lt;=\S)(?=\s*$))</string>
+            <string>(?&lt;!,)(((?==|;|}|(\s+(of|in)\s+)|^\s*$))|((?&lt;=\S)(?=\s*$)))</string>
             <key>patterns</key>
             <array>
               <dict>

TypeScriptReact.tmLanguage

@@ -452,7 +452,7 @@
               </dict>
             </dict>
             <key>end</key>
-            <string>(?&lt;!,)((?==|;|}|(\s+(of|in)\s+)|^\s*$))|((?&lt;=\S)(?=\s*$))</string>
+            <string>(?&lt;!,)(((?==|;|}|(\s+(of|in)\s+)|^\s*$))|((?&lt;=\S)(?=\s*$)))</string>
             <key>patterns</key>
             <array>
               <dict>

tests/baselines/Issue635.baseline.txt

@@ -0,0 +1,50 @@
+original file
+-----------------------------------
+let a: number,
+    b: number,
+    c: number;
+-----------------------------------
+
+Grammar: TypeScript.tmLanguage
+-----------------------------------
+>let a: number,
+ ^^^
+ source.ts meta.var.expr.ts storage.type.ts
+    ^
+    source.ts meta.var.expr.ts
+     ^
+     source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.definition.variable.ts variable.other.readwrite.ts
+      ^
+      source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.type.annotation.ts keyword.operator.type.annotation.ts
+       ^
+       source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.type.annotation.ts
+        ^^^^^^
+        source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.type.annotation.ts support.type.primitive.ts
+              ^
+              source.ts meta.var.expr.ts punctuation.separator.comma.ts
+>    b: number,
+ ^^^^
+ source.ts meta.var.expr.ts
+     ^
+     source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.definition.variable.ts variable.other.readwrite.ts
+      ^
+      source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.type.annotation.ts keyword.operator.type.annotation.ts
+       ^
+       source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.type.annotation.ts
+        ^^^^^^
+        source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.type.annotation.ts support.type.primitive.ts
+              ^
+              source.ts meta.var.expr.ts punctuation.separator.comma.ts
+>    c: number;
+ ^^^^
+ source.ts meta.var.expr.ts
+     ^
+     source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.definition.variable.ts variable.other.readwrite.ts
+      ^
+      source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.type.annotation.ts keyword.operator.type.annotation.ts
+       ^
+       source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.type.annotation.ts
+        ^^^^^^
+        source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.type.annotation.ts support.type.primitive.ts
+              ^
+              source.ts punctuation.terminator.statement.ts

tests/cases/Issue635.ts

@@ -0,0 +1,3 @@
+let a: number,
+    b: number,
+    c: number;